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| SYSTEMS PREPARATION QUESTIONS 2008 - 3 |
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| V. Ryan © 2008-2017 |
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| PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET |
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| The Theme Park owner has commissioned a model clown.
The aim is to frighten younger visitors. A motor inside the clown drives
the arms up and the arms return to their original position when the motor
is off The motor is the output to a 555 timer circuit. The circuit also
produces sound as the arms move. |
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| There are two types of 555 timer. What is the name of
the 555 circuit shown below? |
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| CIRCUIT NAME:
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| ANSWER |
| CIRCUIT NAME: 555 ASTABLE |
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| Label the components on the circuit diagram
below (A TO G). |
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| ANSWER |
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| The relay is causing major problems because an
important component is missing. Name the component and draw its symbol in
the correct position on the circuit diagram above. |
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| COMPONENT NAME:
______________________________ |
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| ANSWER |
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| COMPONENT NAME: DIODE |
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| What is the function of the component ? |
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| ANSWER |
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| The diode protects sensitive components such as the
transistors from back E.M.F. When a current to a relay is removed the
relay can emit current stored in its coils. This can be sent the wrong way
round the circuit damaging components. The diode operates like a one way
valve preventing this from happening. |
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